着色した後房レンズの色覚に関する研究

Studies on color vision of colored intraocular lens.

　白内障術後，患者が青視症を訴えることがある。筆者らは，術後に正常な色感覚を得る目的で，分光透過率が53歳ヒト水晶体に近似した着色後房レンズを試作し，移植眼に種々の色覚検査を行った。その結果，100hue testの総偏差点は，着色後房眼内レンズ移植眼では，透明眼内レンズ移植眼に比べて，有意差に減少したが，紫外線吸収眼内レンズとは有意差はなかった。また，自覚的に羞明・青視症を訴える者が少なかった。

Aging tends to tinge the human lens a yellowish hue and the lens acts as a filter, preventing near ultraviolet rays from affecting retina.

Cyanopsia has been reported following cataract surgery. Intraocular and human lens transmittance differ. To obtain normal postoperative color vision, we prepared an ultraviolet-cut noncyanopsia intraocular lens (UVCY-IOL) that transmittance curve was identical to the human lens of 53 years of age and performed various color vision tests on the IOL implanted eye. Total error score in a 100-hue test significantly decreased in the UVCY-IOL group compared to the clear-IOL group and no significant difference exists between UVCY-IOL group and UV-IOL group. In addition, few subjects complained of photophobia and cyanopsia subjec-tively.